Push-pull passage lock

Abstract

A push-pull passage door lock comprising at least one handle, at least one lever, at least one rotating block, a slipping block, a latch bolt and a reset device for resetting the latch bolt. The lever, rotating block and slipping block are located inside the housing. The lever and rotating block are hinged to the housing. The rotating block comprises a rotation portion and a touch portion located at the two sides of an articulated shaft of the rotating block. One end of the lever is connected to the handle and the other end is adjacent the rotation portion. One end of the slipping block is connected to the latch bolt and the other end is adjacent the touch portion. The lever rotates the rotation portion of the rotating block, whereby the touch portion of the rotating block pushes up the slipping block and thereby retracts the latch bolt.

What is claimed is: 
     
       1. A push-pull door handle assembly, comprising:
 a housing adapted to extend horizontally through a door and having opposite ends extending beyond the door on opposite sides of the door, and the housing having a longitudinal axis; 
 a pair of levers pivotally mounted in the housing and extending in opposite direction, and each lever having an inner end and an outer end; 
 a pair of rotatable blocks pivotally mounted in the housing, adjacent the inner ends of the levers for engagement by the levers, and each rotatable block having a pivot axis; 
 a slipping block slidably mounted in the housing between the rotatably blocks and between the inner ends of the levers; 
 a plunger connected to the slipping block, and being extendable from the door and retractable into the door; and 
 interior and exterior door handles connected to the outer ends of the levers; 
 whereby pushing and pulling the handles pivots the levers so as to rotate the rotatable blocks, thereby sliding the slipping block, whereby the plunger is retracted to allow the door to be opened; and 
 the pivot axes of the rotatable blocks being on opposite sides of the longitudinal axis of the housing. 
 
     
     
       2. The push-pull door handle assembly of  claim 1  further comprising a reset spring mounted in the housing on one end of the slipping block to urge the slipping block to a neutral position after pushing or pulling of the door handles is released. 
     
     
       3. The push-pull door handle assembly of  claim 1  wherein each rotatable block has a pivot axis and each lever has a pivot axis, and the pivot axes of the rotatable blocks are perpendicular to the pivot axes of the levers. 
     
     
       4. The push-pull door handle assembly of  claim 3  wherein the housing has opposite halves with mating surfaces. 
     
     
       5. The push-pull door handle assembly of  claim 4  wherein the rotatable blocks have pivot axes which are parallel to the mating surfaces of the rotatable block halves. 
     
     
       6. The push-pull door handle assembly of  claim 4  wherein the housing has opposite ends and further comprising a cylindrical connection fitting over the halves at each end. 
     
     
       7. The push-pull door handle assembly of  claim 1  wherein the housing has a longitudinal cavity for receipt of the levers and a radial cavity for receipt of the rotatable blocks and the slipping block. 
     
     
       8. The push-pull door handle assembly of  claim 7  wherein the longitudinal cavity extends on opposite sides of the radial cavity. 
     
     
       9. The push-pull door handle assembly of  claim 1  wherein the housing has a central protuberance within which the rotatable blocks and slipping block are mounted. 
     
     
       10. The push-pull handle assembly of  claim 1  wherein the levers pivot about vertical axes. 
     
     
       11. The push-pull handle assembly of  claim 1  wherein the rotating blocks pivot about horizontal axes. 
     
     
       12. A push-pull lock for a door, comprising:
 a housing mountable in the door and having opposite interior and exterior ends; 
 a pair of levers pivotally mounted in the housing and extending horizontally in opposite directions; 
 a pair of rotating blocks pivotally mounted in the housing at a midpoint between the interior and exterior ends for pivotal movement by each of the levers; 
 a slippage block in the housing and being movable from a neutral position to an actuated position by pivotal movement of either of the rotating blocks; and 
 a plunger extending from the housing and connected to the slippage block for retraction when the slippage block is moved to the actuated position. 
 
     
     
       13. The push-pull lock of  claim 12  wherein the levers each have a pivot axis and the rotating blocks each have a pivot axis, and the lever pivot axes being perpendicular to the rotating block pivot axes. 
     
     
       14. The push-pull lock of  claim 12  wherein the housing has longitudinal axis between the interior and exterior ends and the rotating block pivot axes are parallel to the longitudinal axis and the lever pivot axis are perpendicular to the longitudinal axis. 
     
     
       15. The push-pull lock of  claim 12  wherein the housing has a longitudinal axis and the slippage block moves linearly and perpendicular to the housing longitudinal axis. 
     
     
       16. The push-pull lock of  claim 12  further comprising a spring to bias the slippage block to the neutral position. 
     
     
       17. The push-pull lock of  claim 12  further comprising a spring for each lever to bias the lever to a neutral position. 
     
     
       18. The push-pull lock of  claim 12  wherein each lever is adapted to be connected to a handle for pivotal movement when the handle is pushed and pulled. 
     
     
       19. The push-pull lock of  claim 12  wherein each lever is adapted to be connected to a handle for pivotal movement the handle is pushed and pulled. 
     
     
       20. The push-pull lock of  claim 12  wherein the housing has a first cavity for receipt of the levers and a second cavity for receipt of the rotating blocks and the slippage block. 
     
     
       21. The push-pull lock of  claim 20  wherein the first cavity resides on opposite longitudinal sides of the second cavity. 
     
     
       22. The push-pull lock of  claim 12  wherein the levers each have a vertical pivot axis. 
     
     
       23. The push-pull lock of  claim 12  wherein the rotating blocks each has a horizontal pivot axis. 
     
     
       24. The push-pull handle assembly of  claim 12  wherein the housing extends horizontally through the door and beyond opposite inside and outside planes of the door.